416 



GAS7 ER OPODA. 



[PI.A. 



cyrtolites, McChesney, 1859, Pal. Foss., p. 



71, Coal Meas. 

 dentalium, Hall, 1862, 15th Rep. N. Y. 



Mus. Nat. Hist., p. 29, and Pal. N. Y., 



vol. 5, pt. 2, p. 2, Up. Held. Gr. 

 dilatatum, Hall, 1859, Pal. N. Y., vol. 3, 



p. 322, Low. Held. Gr. 

 dumosum, Conrad, 1840, Ann. Rep. N. Y., 



p. 205, and Pal. N. Y., vol. 5, pt. 2, p. 



14, Up. Held. Gr. 



FIG. 94. Platyceras dumosum. 



dumosum var. attenuatum, Meek, 1871, 

 Proc. Acad. Nat. Sci., p. 75, and Ohio 

 Pal., vol. 1, p. 212, Up. Held. Gr. 



dumosum var. rarispinum, Hall, 1862, 

 15th Rep. N.Y. Mus. Nat, Hist., p. 38, and 

 Pal. N. Y., vol. 5, pt. 2, p. 16, Up. 

 Held. Gr. 



echinatum, Hall, 1862, 15th Rep. N. Y. 

 Mus. Nat. Hist., p. 38, and Pal. N. Y., 

 vol. 5, pt. 2, p. 13, Ham. Gr. 



elongatum, Hall, 1859, Pal. N. Y., vol. 3, 

 p. 335, Low. Held. Gr. 



equilaterale, Hall, 1860, Supp. to vol. 1, 



S' , 2, Iowa Rep., p. 89, and Geo. Sur. 

 ., vol. 5, p. 518, Keokuk Gr. 

 erectum, Hall, 1843, (Acroculia erecta,) 



Geo. 4th Dist. N. Y., p. 174, and Pal. 



N. Y., vol. 5, pt. 2, p. 5, Cornif. & 



Ham. Grs. 



expansum, see Strophostylus expansus. 

 fissurellum, Hall, 1860, Supp. to Geo. Rep. 



Iowa, vol. 1, pt. 2, p. 90, and Geo. Sur. 



111., vol. 5, p. 519, Keokuk Gr. 

 fluctuosum, Ulrich, 1886, Cont. to Am. 



Pal., p. 31, Up. Held. Gr. 

 formosum, Keyes, 1888, Proc. Am. Phil. 



Soc., (author's copy, p. 14,) Kinder- 

 hook Gr. 

 fornicatum, Hall, 1862, 15th Rep. N. Y. 



Mus. Nat. Hist., p. 35, and Pal, N. Y., 



vol. 5, pt. 2, p. 11, Up. Held. Gr. 

 fornicatum var. contractum, Hall, 1876, 



Illust. Devonian Foss., pi. 5, Up. 



Held. Gr. 

 gebhardi, Conrad, 1840, Ann. Rep. N. Y., 



L206, and Pal. N. Y., vol. 3, p. 312, 

 w. Held, and Oriskany Grs. 



gibbosum, Hall, 1859, Pal. N. Y., vol. 3, 

 p. 322, Low. Held. Gr. 



haliotoides, Meek & Worthen, 1866, Proc. 

 Acad. Nat. Sci. Phil., p. 264, and Geo. 

 Sur. 111., vol. 3, p. 458, Kinder- 

 hook Gr. 



herzeri, Winchell, 1870, Proc. Am. Phil. 

 Soc., p. 256, Marshall Gr. 



incile, Hall, 1859, Pal. N. Y., vol. 3, p. 332, 



Low. Held. Gr. 

 infundibulum, Meek & Worthen, 1866, 



Proc. Acad. Nat. Sci. Phil., p. 266, and 



Geo. Sur. 111., vol. 5, p. 517, Keo- 

 kuk Gr. 

 intermedium, Hall, 1859, Pal. N. Y., vol. 



3, p. 321, Low. Held. Gr. 

 laciniosum, Ringueberg, 1886, Bull. Buf. 



Soc. Nat. Sci., vol. 5, p. 14, Niag- 

 ara Gr. 

 Isevigatuin, Meek & Worthen, 1866, Proc. 



Acad. Nat. Sci., p. 263, Kaskaskia Gr. 

 lamellosum, Hall, 1859, Pal. N. Y., vol.3, 



p. 330, Low. Held. Gr. 

 latum, Keyes, 1888, Proc. Am. Phil. Soc., 



(author's copy, p. 14,) Burlington Gr. 

 lodiense, Meek, 1871, Proc. Acad. Nat. 



Sci. Phil., p. 170, and Ohio Pal., vol. 2, 



p. 313, Waverly Gr. 

 magnificum, Hall, 1859, Pal. N. Y., vol. 3, 



p. 476, Oriskany sandstone, 

 membranaceum, Ringueberg, 1886, Bull. 



Buf. Soc. Nat. Sci., vol. 5, p. 15, Niag- 

 ara Gr. 

 minutissimum, Walcott, 1879, Desc. New 



Spec. Foss., p. 1, Calciferous Gr. 

 multisinuatum, Hall, 1859, Pal. N. Y., 



vol. 3, p. 319, Low. Held. Gr. 

 multispinosum, Meek, 1871, Proc. Acad. 



Nat. Sci. Phil., p. 73, and Ohio Pal., 



vol. 1, p. 210, Cornif. Gr. 

 naticoides, Etheridge, 1878, Quar. Jour. 



Geo. Soc., vol. 34, p. 603, Up. Sil. 

 nebraskense, Meek, 1872, Pal. E. Neb., p. 



227, Coal Meas. 

 newberryi, Hall, 1859, Pal. N. Y., vol. 3, 



p. 333, Low. Held. Gr. 

 niagarense, Hall, 1852, (Acroculia niag- 



arensis,) Pal. N. Y., vol. 2, p. 288, Ni- 

 agara Gr. 

 nodosum, Conrad, 1841, Ann. Rep. N. Y., 



p. 56, and Pal. N. Y., vol. 3, p. 473, 



Oriskany sandstone, 

 obesum, Hall, 1859, Pal. N. Y., vol. 3, p. 



329, Low. Held. Gr. 

 obliquum, Keyes, 1888, Proc. Am. Phil. 



Soc., (author's copy, p. 13,) Burling- 

 ton Gr. 

 occidens, Walcott, 1885, Monogr. U. S. 



Geo. Sur., vol. 8, p. 254, Subcarbon- 



iferous. 

 ovale, Stevens, 1858, (Acroculia ovalis,) 



Am. Jour. Sci., vol. 25, p. 261, Subcar- 



boniferous. 

 pabulocrinus, Owen, 1862, (Pileopsis pa- 



bulocrinus,) Geo. Sur, Indiana, p. 364, 



Keokuk Gr. 

 paralium, White & Whitfield, 1862, Proc. 



Bost. Soc. Nat. Hist., vol. 8, p. 302, 



Kinderhook Gr. 

 patulum, Hall, 1859, Pal. N. Y., vol. 3, p. 



477, Oriskany sandstone, 

 pentalobus, Hall, 1859, Pal. N. Y., vol. 3, 



p. 319, Low. Held. Gr. 

 perlatum, Hall, 1859, Pal. N. Y., vol. 3. p. 



328, Low. Held. Gr. 

 perplexum, Hall, 1876, Illust. Devonian 



Foss., pi. 2, Up. Held. Gr. 



